Dazai was a girl, simple as that. Thing is, though, is that she cut her hair shortly after becoming a mafia executive and started dressing like a boy, so ever since she was fourteen, anyone new she meets just assumes that's what she is. A boy.  It helped that when puberty hit, her boobs barely grew and she ended up pretty tall - easily able to pass off as a guy.

It was fine, really. She honestly couldn't give less of a shit. Her gender isn't a secret, and everyone will piece it together eventually after meeting her. Everyone except Chuuya, apparently. Dazai didn't even know that Chuuya didn't know. After all, why wouldn't he? They've known eachother since they were fifteen, now eighteen years old, and they've been dating for a whole year now! How could Chuuya not know??

Well, Chuuya doesn't know. Somehow, he thinks that he has a boyfriend named Dazai. Too be fair, he's never seen Dazai naked or in skin tight clothes, she acts like a boy, she looks like a boy, and she has more boyish interests. Either way, that's going to change today.

Tonight, Chuuya and Dazai have been put on a mission to infiltrate a gala and gather information on a wealthy man there. The two are going as a couple and have already been assigned their outfits. To Chuuya's shock, he opened the box with his mission attire to find a tux. Not that he's complaining, he just figured that, being the shorter out of him and Dazai, he would be the one posing as a girl.

That confusion was cleared up almost immediately when he met up with Dazai where they agreed and found her standing in a stunning red dress that hugged her hips and waist beautifully, (unnecessary) high heels, makeup that highlights her more feminie features, short hair styled to look more girlish, and- THAT CHEST IS NOT FLAT!

Chuuya's jaw almost immediately dropped at the sight of his partner. "Osamu... you're- you have boobs." He blurts out, immediately regretting it.